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-rw-r--r--actionmailer/test/assert_select_email_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/test/assert_select_email_test.rb b/actionmailer/test/assert_select_email_test.rb
index bf14fe0853..0a99e0c8f3 100644
--- a/actionmailer/test/assert_select_email_test.rb
+++ b/actionmailer/test/assert_select_email_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "abstract_unit"
class AssertSelectEmailTest < ActionMailer::TestCase